gecko-dev/tools/reorder/elf_symbol_table.h
2012-05-21 12:12:37 +01:00

83 lines
2.2 KiB
C++

/* -*- Mode: C++ -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef elf_symbol_table_h__
#define elf_symbol_table_h__
/*
Utility class for reading ELF symbol tables.
*/
#include <elf.h>
#include <sys/mman.h>
#include "interval_map.h"
class elf_symbol_table {
protected:
int m_fd;
void *m_mapping;
size_t m_size;
const char *m_strtab;
const Elf32_Sym *m_symbols;
int m_nsymbols;
int m_text_shndx;
typedef interval_map<unsigned int, const Elf32_Sym *> rsymtab_t;
rsymtab_t m_rsymtab;
int verify_elf_header(const Elf32_Ehdr *hdr);
int finish();
public:
elf_symbol_table()
: m_fd(-1),
m_mapping(MAP_FAILED),
m_size(0),
m_strtab(0),
m_symbols(0),
m_nsymbols(0),
m_text_shndx(0) {}
~elf_symbol_table() { finish(); }
/**
* Read the symbol table information from the specified file. (This will
* memory-map the file.)
*
* Currently, only symbols from the `.text' section are loaded.
*/
int init(const char *file);
/**
* Determine what symbol the specified image address corresponds
* to. Addresses need not refer to a symbol's start address:
* symbol size information is used to reverse-map the address.
*/
const Elf32_Sym *lookup(unsigned int addr) const;
/**
* Determine the symbol name for the specified symbol.
*/
const char *get_symbol_name(const Elf32_Sym *sym) const;
/**
* Return `true' if the specified symbol is a function.
*/
bool is_function(const Elf32_Sym *sym) const {
return (sym->st_size > 0) &&
(ELF32_ST_TYPE(sym->st_info) == STT_FUNC) &&
(sym->st_shndx == m_text_shndx); }
typedef const Elf32_Sym *const_iterator;
const_iterator begin() const { return const_iterator(m_symbols); }
const_iterator end() const { return const_iterator(m_symbols + m_nsymbols); }
};
#endif // elf_symbol_table_h__